<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        * {
            margin: 0;
            padding: 0;
            list-style: none;
        }

        .box {
            width: 90%;
            margin: 0 auto;
            overflow: hidden;
            position: relative;
        }

        ul {
            display: flex;
            position: relative;
            left: 0;
            transition: left .2s linear;

        }

        ol {
            display: flex;
            position: absolute;
            bottom: 10px;
            width: 100%;
            left: 0;
            justify-content: center;
        }

        ol>li {
            width: 10px;
            height: 10px;
            background-color: #fff;
            margin: 0 8px;
        }

        ol>li.action {
            background-color: black;
        }

        img {
            border-radius: 5px;
            display: block;
        }

        .boximg {
            width: 90vw;

        }

        .box span {
            border: 1px solid #000;
            padding: 0 10px;
            position: absolute;
            line-height: 40px;
            top: calc(50% - 20px);
            background-color: rgba(255, 255, 255, 0.595);
        }

        .prev {
            left: 0;
        }

        .next {
            right: 0;
        }
    </style>
</head>

<body>
    <div class="box">
        <ul>
            <!-- <li>
                <img src="" alt="">
            </li> -->
        </ul>
        <ol>
            <!-- <li></li> -->
        </ol>
        <span class="prev">上一张</span>
        <span class="next">下一张</span>
    </div>

    <script>
        var image = ["https://m15.360buyimg.com/mobilecms/s1062x420_jfs/t1/33428/39/16450/106681/6311cad7Ef9b3d856/f10720b7f8f38937.jpg!cr_1053x420_4_0!q70.jpg",
            "https://m15.360buyimg.com/mobilecms/jfs/t1/3230/40/20384/44107/62daf2d9E5c5e0e55/03ab360c40ddc266.jpg!cr_1125x449_0_166!q70.jpg",
            "https://m15.360buyimg.com/mobilecms/jfs/t1/110775/22/28940/94917/62e5bc6dE569b2244/5d14fc9f06d87341.jpg!cr_1125x449_0_166!q70.jpg",
            "https://m15.360buyimg.com/mobilecms/s1062x420_jfs/t1/33428/39/16450/106681/6311cad7Ef9b3d856/f10720b7f8f38937.jpg!cr_1053x420_4_0!q70.jpg",];


        var ul = document.querySelector('.box > ul');
        var ol = document.querySelector('.box > ol');
        var box = document.querySelector('.box');

        var str = '', str1 = '';
        for (var k = 0; k < image.length; k++) {
            str += `<li><img class="boximg" src='${image[k]}' alt=""> </li>`;
            if (k == 0) {
                str1 += `<li class= 'action'></li>`
            } else if (k < image.length - 1) {
                str1 += `<li></li>`
            }
        }
        ul.innerHTML = str;
        ol.innerHTML = str1;
        ul.style.width = image.length * box.offsetWidth + "px";



        // 点击上一张下一张 获取ul
        // 自动轮播
        // 取消自动轮播
        // 点击小圆点
        var prev = document.querySelector('.prev');
        var next = document.querySelector('.next');
        var ollis = document.querySelectorAll('.box > ol >li');

        // 当前显示图片的索引值
        var i = 0;

        next.onclick = nextFun;
        function nextFun() {
            i++;
            // 设置ul的移动
            ulLeft()

            // 在点击下一张时，判断如果是最后一张了（复制的第一张）
            //  需要在动画执行完成后瞬间跳到第一张
            if (i == image.length - 1) {
                i = 0;
                setTimeout(function () {
                    ul.style.transitionDuration = '0s';
                    ul.style.left = '0px';
                }, 200)
            }
            yuan()
        }
        prev.onclick = function () {
            i--;
            if (i == -1) {
                i = 2;
                ul.style.transitionDuration = '0s';
                var l = (i + 1) * -box.offsetWidth;
                ul.style.left = l + 'px';
            }
            setTimeout(ulLeft, 10)
            yuan()
        }
        function yuan() {
            for (var n = 0; n < ollis.length; n++) {
                ollis[n].classList.remove('action');
            }
            ollis[i].classList.add('action');
        }
        function ulLeft() {
            ul.style.transitionDuration = '0.2s';
            var l = i * -box.offsetWidth;
            ul.style.left = l + 'px';
        }
        for (let m = 0; m < ollis.length; m++) {
            ollis[m].onclick = function () {
                i = m;
                ulLeft()
                yuan()
            }
        }
        var time = setInterval(nextFun, 2000);
        box.onmouseenter = function () {
            clearInterval(time);
        }
        box.onmouseleave = function () {
            time = setInterval(nextFun, 2000);
        }
    </script>
</body>

</html>